======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '255'
                                          'artist'  'Big Brother & the Holding Comp'
                                     'text_people'  ''
                                         'release'  'Billboard Top Pop Singles of 1968'
                                           'title'  'Piece Of My Heart (Columbia)'
                                           'quals'  ("['Q-JZFKS-1', 'Q-OLDST-3', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', 'Q-UNU-1', "
 "'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-2', 'q-chart-3', "
 "'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-3', 'q-mixbeat-2']")
                                      'lastfmtags'  "['classic rock', 'psychedelic rock', 'blues', 'psychedelic', 'rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '96'
                                      'tracktotal'  ''
                                            'date'  '1968'
                                        'comments'  ''
                                           'genre'  'electronic-generic or radio-unsorted;set-pl-billboard'
                                             'bpm'  '145.371'
                                             'key'  '1B'
                                        'acoustid'  ''
rest: ''

======================== rawer (from filesystem) ========================

'COMM:ID3v1 Comment:XXX'                            'Billboard'
'TALB' (Album/Movie/Show title)                     'Billboard Top Pop Singles of 1968'
'TBPM' (BPM (beats per minute))                     '145.371'
'TCON' (Content type, a.k.a. Genre)                 ['electronic-generic or radio-unsorted', 'set-pl-billboard']
'TDRC' (Recording time)                             '1968'
'TIT2' (Title/songname/content description)         'Piece Of My Heart (Columbia)'
'TKEY' (Initial key)                                '1B'
'TPE1' (Lead performer(s)/Soloist(s))               'Big Brother & the Holding Comp'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '96'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['classic rock', 'psychedelic rock', 'blues', 'psychedelic', 'rock']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '-0.41 dB'
'TXXX:replaygain_track_peak'                        '0.530510'

========================== row from database ==========================
                                              'id'  1318116
                                            'path'  /data/Music/Bulk/00poprockelectronic/Billboard/Billboard Top100/1968/096 - Big Brother & the Holding Company - Piece Of My Heart (Columbia).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  255
                                           'genre'  electronic-generic or radio-unsorted;set-pl-billboard
                                        'filesize'  4082690
                                           'mtime'  1620384937
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic Top100 096 Company electronic generic or radio unsorted;set pl billboard
                                      'tag_artist'  Big Brother & the Holding Comp
                                     'tag_release'  Billboard Top Pop Singles of 1968
                                       'tag_title'  Piece Of My Heart (Columbia)
                                             'bpm'  145.371
                                    'search_title'  'columbia':5,6 'heart':4 'my':3 'of':2 'piece':1
                                   'search_artist'  'big':1 'brother':2 'comp':5 'holding':4 'the':3
                                  'search_release'  '1968':6 'billboard':1 'of':5 'pop':3 'singles':4 'top':2
                                     'search_rest'  '00poprockelectronic':1 'billboard':13 'company':3 'electronic':4 'generic':5 'or':6 'pl':12 'radio':7 'set':9,11 'top100':2 'unsorted':8,10
                                    'search_combo'  '00poprockelectronic':18 '1968':17C 'big':7B 'billboard':12C,30 'brother':8B 'columbia':5A,6A 'comp':11B 'company':20 'electronic':21 'generic':22 'heart':4A 'holding':10B 'my':3A 'of':2A,16C 'or':23 'piece':1A 'pl':29 'pop':14C 'radio':24 'set':26,28 'singles':15C 'the':9B 'top':13C 'top100':19 'unsorted':25,27
                                    'tag_tracknum'  96
                                      'num_images'  0
                                             'key'  1B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-3', 'q-other-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['classic rock', 'psychedelic rock', 'blues', 'psychedelic', 'rock']
                                        'tag_date'  1968
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620384936.5523915  (2021-05-07 12:55:36)
                             'size'  4082690